Examlex
As Joe prepares to spar with a tae kwon do opponent, his heart rate and respiration rate increase. These are indicators that which branch of the nervous system has been activated?
Agonist
A chemical substance that binds to and activates specific receptors on cells, leading to a biological response.
Body Movement
The physical action resulting from the contraction of muscles, enabling humans and animals to change their position or location.
Sarcoplasm
The cytoplasm of a muscle fiber that contains organelles, including mitochondria and the sarcoplasmic reticulum, involved in muscle contraction.
Myofibrils
Long, slender threads found in muscle cells, responsible for muscle contraction through the actin and myosin filaments they contain.
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